Digital Commons Network^™

Robust Frequency-Domain Turbo Equalization For Multiple-Input Multiple-Output (Mimo) Wireless Communications, Jian Zhang

Doctoral Dissertations

"This dissertation investigates single carrier frequency-domain equalization (SC-FDE) with multiple-input multiple-output (MIMO) channels for radio frequency (RF) and underwater acoustic (UWA) wireless communications. It consists of five papers, selected from a total of 13 publications. Each paper focuses on a specific technical challenge of the SC-FDE MIMO system. The first paper proposes an improved frequency-domain channel estimation method based on interpolation to track fast time-varying fading channels using a small amount of training symbols in a large data block. The second paper addresses the carrier frequency offset (CFO) problem using a new group-wise phase estimation and compensation algorithm to combat …

Adsorption And Segmental Dynamics Of Acrylate And Methacrylate Polymers Adsorbed On A Silica Surface, Piyawan Krisanangkura

Doctoral Dissertations

"Poly(isopropyl acrylate)-d₇ (PIPA- d₇) was studied using ²H solid-state NMR and modulated differential scanning calorimetry (MDSC). The polymer was deuterated on the methyl groups and side-chain methine. The PIPA- d₇ was adsorbed onto Cab-O-Sil silica. These two types of deuterons each showed their own characteristic deuterium nuclear magnetic resonance (NMR) spectra for bulk PIPA- d₇. The ²H NMR spectra of adsorbed PIPA- d₇ samples showed the presence of heterogeneity of the segmental dynamics. A residual powder pattern was found in the spectra of the surface samples at higher temperatures, indicating that the segments were tightly attached to the silica. The …

Dead Time And Count Loss Determination For Radiation Detection Systems In High Count Rate Applications, Amol Patil

Doctoral Dissertations

"This research is focused on dead time and the subsequent count loss estimation in radiation detection systems. The dead time is the minimum amount of time required between two events to permit detection of those events individually by a radiation detection system. If events occur during the system dead time, they are lost. Such lost information can be important in many applications including high-precision spectroscopy, positron emission tomography (PET), and the scanning of spent nuclear fuel. Understanding of the behavior of radiation detection systems is important; thus this work included a comprehensive review of dead time and pulse pile-up models …

Factors Controlling Ductility In Ultrafine Grain Aluminum Alloys Under Monotonic And Cyclic Loading, Partha Sarathi De

Doctoral Dissertations

"Ultrafine grained (UFG) Al processed by severe plastic deformation (SPD) methods are characterized by high strength and a limited uniform ductility. Friction stir processing (FSP), an offshoot of friction stir welding has emerged as a new technique to produce UFG alloys. FSP-UFG Al alloys show a distinctly different behavior with higher uniform elongation and improved high cycle fatigue life as compared to other SPD processed variants. The objective of this work was to study the microstructural basis for such mechanical behavior in FSP-UFG Al alloys.

To study the mechanical behavior of FSP Al alloys, a subsize bending fatigue and uniaxial …

Identifying Multiple Steady States In The Design Of Reactive Distillation Processes, Thomas Karl Mills

Doctoral Dissertations

"Global homotopy continuation is used to identify multiple steady states in ideal reactive flash and reactive distillation systems involving a reaction of the form A+B [symbol for <--> C taking place in the liquid phase. The choice of specifications has an influence on the existence of multiple solutions for both the flash and the column. For the flash, specification of the heat input or withdrawal can give rise to multiplicities while specification of the split fraction does not. Specification of one internal energy balance variable and one external material balance variable does not produce multiplicities in the column; however, specification of …

A Study Of The Growth And Structure Of Chromium And Iron Oxide Films On Pd(001) Using X-Ray Photoelectron Diffraction And Low Energy Electron Diffraction, Tina Dhekial-Phukan

Doctoral Dissertations

"In this study, attempts were made to grow well-ordered chromium- and iron-oxide films on a Pd(001) surface, and two sample preparation techniques, the multilayer and the sequential growth techniques, were used to grow these transition metal oxide films. The study is a part of a larger project that aims to look into the interaction between metal substrates and the overlayers grown on them. Previous studies of oxide films on Ag(001) resulted in the growth of 4-fold and 3-fold symmetry oxide structures from the multilayer and sequential growth techniques respectively. The present investigation's goal was to study how the growth of …

Application Of Quality Engineering To Investment Portfolio Selection And Optimization, Vivek Kulinchandra Jikar

Doctoral Dissertations

"The Taguchi System of Quality Engineering (TSQE) is a widely accepted philosophy and set of tools and techniques to rapidly design and manufacture high quality, low cost products and services. It is heavily focused on creating stable system designs that allow a product or system to perform as desired by customers in the environment of their choice. This research demonstrates the power of the TSQE to manage an investment portfolio. In particular, it uses the concept of design stability to select investments and optimize portfolios. It proposes a new design stability-based investment screening metric and discusses its application. Further, this …

Emerging Technology Supply Chain Model For Additive Manufacturing, David M. Dietrich

Doctoral Dissertations

"This research concerns developing an emerging manufacturing technology, additive manufacturing (AM), into a mature and flexible, cost-effective supply chain for aerospace production. The field of additive manufacturing is an approach to low volume manufacturing of plastic or metal parts using three dimensional Computer Aided Design data. As an emerging technology, AM's supply chain is not established compared to conventional aerospace manufacturing technologies, such as injection molding or composite manufacturing. Technical and business challenges limit the robustness of the additive manufacturing system for aerospace applications. The overall intent of this research is to: first, provide an introduction to two main polymer …

Improvised Explosive Device Crater Repair For Enduring Route Remediation, Daniel Roman Kienitz

Doctoral Dissertations

"Recent road repairs performed on main supply routes (MSRs) and alternative supply routes (ASRs) in Iraq and Afghanistan revealed several deficiencies in current repair techniques. Temporary solutions such as aggregate backfill, asphalt, and traditional concrete repairs were unacceptable due to the ease of emplacement of additional improvised explosive devices (IEDs). In addition to the threat of IED placement, the threat from exposure of the repair teams to enemy attack during placement and curing was substantial. In order to address these problems, this project investigated rapid hardening materials for improvised explosive device crater repair. A laboratory test program along with performance …

Principals' Leadership Styles And Their Impact On School Climate: Assistant Principals' Perceptions, Bruce R. Mccolumn

College of Graduate Studies: Theses & Dissertations

The primary focus of this study is to explore the perceptions of assistant principals as to how their principals' leadership styles impact school climate. A school's climate plays a vital role in student achievement and principals are the most important factor in setting a setting a school's climate. Therefore, principals' leadership behaviors warrant investigating. This qualitative study identified principal leadership styles through the perceptions of their assistant principals. Interactive interviews were conducted with selected assistant principals in the XYZ School System. Their responses were analyzed, themed and coded to draw a connection between principal leadership style and school climate. These …

Art And Memory: An Examination Of The Learning Benefits Of Visual-Art Exposure, James Tyler Rosier

College of Graduate Studies: Theses & Dissertations

Past research has indicated that art education can be beneficial to students' education, possibly through beneficial effects related to learning and memory. Although some prior research has explored effects of art education for children, relatively little research has investigated beneficial effects of art in relation to adult learners. The aim of the current study was to explore whether a beneficial relationship exists between art and memory for adults in the context of an experimental study. Participants were randomly assigned to one of four conditions: Engaging in creative art, viewing art, discriminating among visually presented shapes, and writing a description of …

Xenophobia: The Consequences Of Being A Zimbabwean In South Africa, Philip Edward Culbertson

Theses and Dissertations

This paper seeks to explain and describe the xenophobia and xenophobic attacks of Zimbabwean refugees and migrants in South Africa. The political and social instability in Zimbabwe has led to mass exodus of Zimbabweans in search of stability and a means to survive. Many of these Zimbabweans have sought opportunity and refuge in South Africa only to be met with hurdles that metastasized into xenophobia. Research was done on the target population of Zimbabweans in Central Methodist Church in Johannesburg, along with interviews conducted through Medicines Sans Frontiers, and active players in the civil society in Cape Town.

Reading Stoneridge Carefully: A Duty-Based Approach To Reliance And Third Party Liability Under Rule 10b-5, Donald C. Langevoort

Georgetown Law Faculty Publications and Other Works

The Supreme Court's decision in the Stoneridge case has largely been interpreted as a imposing a strict, pro-defendant reliance requirement. This article offers an alternative reading that takes the Court's analysis more seriously than its overheated dicta, one that makes "remoteness" a serious and meaningful inquiry that can produce balanced and fair responses to the concern that seemed to motivate the search for restraint: fear of disproportionate liability. It explores the nature of the dispropotion, and suggests ways--using the Court's own explanatory tools--for deciding when third party involvement is close enough to the fraud so that fear of disproportion lessens. …

The National Individual Health Insurance Mandate: Ethics And The Constitution, Lawrence O. Gostin

Georgetown Law Faculty Publications and Other Works

Within weeks, after signing the nation’s first comprehensive health insurance reform, twenty states filed lawsuits challenging the constitutionality of the Bill’s most politically charged feature—an individual purchase mandate. If anything, the tax penalty is too low compared with the cost of insurance, so it may not sufficiently incentivize healthy individuals. But it remains deeply controversial because it compels individuals to purchase coverage they choose not to have, raising the question whether Congress can lawfully and ethically require individuals to contract with, and transfer money to, a private party. To be sure, the individual mandate lacks a clear American precedent. (It …

Systemic Regulation Of Global Trade And Finance: A Tale Of Two Systems, R. Michael Gadbaw

Georgetown Law Faculty Publications and Other Works

The recent financial crisis has put enormous strains on the global systems governing international finance and trade. These two important international regulatory systems, created after World War II to promote growth and stability in the global economy, were put to the test in ways unprecedented since the 1930s. This article seeks to analyze and compare their performance as systemic regulators in the course of the crisis and concludes that the trading system performed quite well while the financial system virtually collapsed. This article seeks to account for this difference by looking at the nature of the rules and the institutions …

Unfair Competition And Uncommon Sense, Rebecca Tushnet

Georgetown Law Faculty Publications and Other Works

This article discusses Mark McKenna’s Testing Modern Trademark Law’s Theory of Harm as an important step forward in challenging trademark expansionism, going back to basics and asking us to assess for truth value several propositions that now seem so self-evident to lawyers and judges as to not require any empirical support at all. Like McKenna, the author believes that if the law looked for the evidence behind present axioms of harm, it would not find much there. McKenna and the author share an interest in empirical evidence on marketing and a desire to bring its insights to trademark law. But …

Disparate Impact, Girardeau A. Spann

Georgetown Law Faculty Publications and Other Works

There has been a lot of talk about post-racialism since the 2008 election of Barack Obama as the first black President of the United States. Some have argued that the Obama election illustrates the evolution of the United States from its unfortunate racist past to a more admirable post-racial present in which the problem of invidious racial discrimination has largely been overcome. Others have argued that the Obama election illustrates only that an extraordinarily gifted, mixed-race, multiple Ivy League graduate, Harvard Law Review President was able to overcome the persistent discriminatory racial practices that continue to disadvantage the bulk of …

Rights, Harms, And Duties: A Response To Justice For Hedgehogs, Robin West

Georgetown Law Faculty Publications and Other Works

The author responds to the three jurisprudential positions that Ronald Dworkin discusses in his book--albeit briefly--so as to integrate them into his hedgehoggian program. The first is that we should think of rights as political trumps, such that the individual liberty protected by the right, and hence the behavior protected by the right, trumps in importance and in effect, both in law and in popular imaginings, the various collective goals with which the right might be in conflict. Second, we should think about our collective life, and the principles that should guide it, through the lens of the rights of …

The Unity Of Interpretation, Lawrence B. Solum

Georgetown Law Faculty Publications and Other Works

What is interpretation? One can imagine a range of answers to this question. One answer might begin with the observation that the English word “interpretation” is used to refer to a variety of human activities. Translators at the United Nations interpret remarks made in French when they offer an English translation. Literary critics interpret novels when they investigate the deep and sometimes unconscious motivations of the author. Conductors interpret a score when they make decisions about meter, tempo, and dynamic range. Actors interpret a screenplay when they improvise new lines based on their understanding of the characters. Judges interpret statutes …

Honest-Services Fraud: A (Vague) Threat To Millions Of Blissfully Unaware (And Non-Culpable) American Workers, Julie R. O'Sullivan

Georgetown Law Faculty Publications and Other Works

The author believes that statute 18 U.S.C. § 1346 is unconstitutionally vague, at least as applied to cases in which employees of private entities are prosecuted for depriving their employers of a right to their honest services (so-called “private cases”). Objections to vagueness rest on due process. “Vagueness may invalidate a criminal law for either of two independent reasons. First, it may fail to provide the kind of notice that will enable ordinary people to understand what conduct it prohibits; second, it may authorize and even encourage arbitrary and discriminatory enforcement.” The Supreme Court’s vagueness precedents do not provide much …

Integration And Characterization Of An Electrical Storage System For A Hydrogen Fuel Cell Plug-In Hybrid Electric Vehicle, Edward Alexei Anculle Arauco

Masters Theses

"Hydrogen fuel cell hybrid vehicles are an advance technology that promises to solve the energy crisis in transportation and green houses emissions. Even more, Plug-in or extended range vehicles can add diversity in energy sources. Extended range vehicles have the capability to extract energy from the grid and hence reduce the cost of operation of the vehicle. EcoCAR: the NeXt Challenge is a Noth [sic] American competition with seventeen schools participating across North America. Missouri S&T is developing a Fuel Cell Plug-in Hybrid electric vehicle which has a large lithium-ion battery able to store 16 kWh. The fuel cell powertrain …

Analysis Of Eurycea Hybrid Zone In Eastern Missouri, Bonnie Jean Beasley

Masters Theses

"Evolutionary mechanisms are often difficult to observe in action because evolution generally works slowly over time. Hybrid zones provide a unique opportunity to observe many evolutionary processes, such as reinforcement, because of the rapid changes that tend to occur in these zones. Salamanders provide an ideal model for examining the rapid changes in populations that result from hybridization because many closely-related species lack reproductive barriers. In Missouri, a well-documented hybridization zone exists among the two subspecies Eurycea longicauda longicauda (long-tailed salamander) and E. L. melanopleura (dark-sided salamander). These salamanders inhabit caves, limestone creek beds, and abandoned mine shafts. A closely …

Analysis Of The Theta-D Filter As Applied To Hit-To-Kill Interceptors And Satellite Orbit Determination, Michael W. Dancer

Masters Theses

"When designing feedback control systems, there is often a need for estimation methods that provide system information that is not readily available via sensors placed within the system. In many cases a sensor that measures a particular system state either does not exist or is prohibitively expensive. In addition, all realistic systems contain some degree of nonlinearity. This thesis focuses on two such cases: missile guidance with bearings-only measurements and GPS satellite orbit determination. In each case, a new nonlinear filter, the [theta]-D method, is used and evaluated for its performance in providing the necessary estimation. To aid the filter …

Representation And Validation Of Domain And Range Restrictions In A Relational Database Driven Ontology Maintenance System, Patrick Garrett. Edgett

Masters Theses

"An ontology can be used to represent and organize the objects, properties, events, processes, and relations that embody an area of reality [1]. These knowledge bases may be created manually (by individuals or groups), and/or automatically using software tools, such as those developed for information retrieval and data mining. Recently, the National Science Foundation funded a large collaborative development project for the semi-automated construction of an ontology of amphibian anatomy (AmphibAnat [2]). To satisfy the extensive community curation requirements of that project, a generic, Web-based, multi-user, relational database ontology management system (RDBOM [3]) was constructed, based upon a novel theoretical …

Internet-Accessible Hot Cell With Gamma Spectroscopy At The Missouri University Of Science And Technology Research Nuclear Reactor, Edwin Grant

Masters Theses

A dual-chambered internet-accessible heavily shielded facility with pneumatic access to the University of Missouri Science and Technology (Missouri S&T) 200 kW Research Nuclear Reactor (MSTR) core has been built and is currently under low level irradiation testing. The facility allows distance users doing collaborative work with Missouri S&T researchers to manipulate and analyze neutron irradiated samples remotely. The system consists of two shielded compartments, one for multiple sample storage (up to 11 samples), and the other for isolated radiation measurements and spectroscopy. The second chamber has multiple detector ports, graded shielding, and has the capability to support gamma spectroscopy using …

Validation Of Driving Simulator And Driver Perception Of Vehicle Mounted Attenuator Markings In Work Zones, Durga Raj Mathur

Masters Theses

"This research work sought to validate the driving simulator at Missouri University of Science and Technology and to evaluate the vehicle mounted attenuator (VMA) markings for various times of day. For comprehensive validation of the driving simulator, a framework is proposed which is demonstrated using a fixed-base driving simulator. Objective and subjective evaluations were conducted, and validation of the driving simulator was performed at specific locations and along the highway. Field data were collected for a partial lane closure using a global positioning system (GPS) along the work zone and supplemented with video recordings of traffic data at specific locations …

Quantification Of Channel Performance And Development And Characterization Of Small Magnetic Field Probes, Surbhi Mittal

Masters Theses

"This thesis presents a new approach to quantifying channel performance using a transmitter waveform and dispersion penalty (TWDP) with frequency domain S-parameter data. Initially TWDP was defined to characterize the performance of a transmitter in optical links. More recently its use has been extended to include the quantification of channel performance, especially in high-speed copper links. This project focused mainly on channel characterization. Instead of using the time-domain oscilloscope measurements involved in the original approach, it proposes a new method that relies on frequency-domain S-parameter data obtained either from measurements or simulations. It included a parametric study of TWDP with …

Content Based Image Retrieval For Bio-Medical Images, Vikas Nahar

Masters Theses

"Content Based Image Retrieval System (CBIR) is used to retrieve images similar to the query image. These systems have a wide range of applications in various fields. Medical subject headings, key words, and bibliographic references can be augmented with the images present within the articles to help clinicians to potentially improve the relevance of articles found in the querying process. In this research, image feature analysis and classification techniques are explored to differentiate images found in biomedical articles which have been categorized based on modality and utility. Examples of features examined in this research include: features based on different histograms …

Modeling And Analysis Of High-Speed Sources And Serial Links For Signal Integrity, Siming Pan

Masters Theses

"As the computer and electronics industry moves towards higher data rates, signal integrity and electromagnetic interference (EMI) problems always present challenges for designers for high-speed data communication systems. To characterize the entire link path between transmitters and receivers, accurate models for sources, passive link path (such as traces, vias, connectors, etc), and terminations should be built before simulations either in frequency or time domain. Due to the imperfection of model, data corrections are preferred before time-domain simulations to ensure stability. Moreover, data obtained from models should be compared with measurement results to judge the level of agreement for validations. This …

Contribution-Based Priority Assessment In A Web-Based Intelligent Argumentation Network For Collaborative Software Development, Maithili Satyavolu

Masters Theses

"Decision making is an important aspect of the collaborative software development process which usually involves complex process of conflict resolution. Stakeholders approach decision making process from multiple perspectives and their priorities play a vital role in it. The priority assessment methods used in the argumentation process so far are usually static. Priorities remain constant throughout the decision making process. In order to make the collaborative system more closely replicate real-world scenarios, this work incorporates dynamic priority assessment into a web-based collaborative system which is based on intelligent computational argumentation. It evaluates priorities dynamically for each cycle of decision process based …